namespace CSharpPro._1103;
using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

// User类仅包含字段、属性和构造函数
public class User
{
    public string Username { get; set; }
    public string Password { get; set; }

    public User(string username, string password)
    {
        Username = username;
        Password = password;
    }
}

public interface IUserService
{
    void Run();
    bool Register(string username, string password);
    bool Login(string username, string password);
    bool DeleteUser(string username);
}


